3-Nitro-5-chloromethylsalicylaldehyde in the synthesis of photochromic spirochromenes of the indoline series |
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Authors: | E. V. Braude M. A. Gal'bershtam |
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Affiliation: | (1) Scientific-Research Institute of Organic Intermediates and Dyes, 103787 Moscow |
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Abstract: | The nitration of 5-chloromethylsalicylaldehyde leads to 3-nitro-5-chloromethylsalicylaldehyde, the chlorine atom in which is smoothly replaced by a hydroxy or acetoxy group. The salicylaldehydes obtained condense with 1,3,3-trimethyl-2-methylene-indoline to give the corresponding photochromic indolinespirochromenes. The spectral-kinetics of the photochromic transformations of the spirochromenes are discussed.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 196–199, February, 1978. |
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